Datasheet
B/111
Prod.-No. 08072
Standard execution with 2 chip spaces, spiral grooved.
n More precise hole diameter through cylindrical steps.
n Immediate deburring through the next step
n Drilling of sheet metals as thin as 4 mm possible.
n Use coolant stick!
n The keyway allows the drill to make a chipping cut during drilling for
better chip removal.
n Longer cutting edge compared to the usual straight groove and notice-
ably easier cutting.
n Laser-etched scale in the chip space to indicate the bore diameter achie-
ved.
Description Bore range Shank Ø Length Prod.-No.
AM-12 4 - 12 mm x 1 mm 6.0 70 mm 08070
AM-20 6 - 20 mm x 2 mm 9.0 77 mm 08071
AM-30 6 - 30 mm x 2 mm 10.0 98 mm 08072
Set in plastic case 08073
Contents:
1 of each Type AM-12/AM-20/AM-30
High-performance coolant stick 09012
Standard values for the use of ALFRA Multi-step
drills
This drill was developed to bore perfectly round and deburred holes in
sheet metal from 4 - 6 mm thick. The transition forms a radius which ser-
ves to deburr or bevel the hole at the same time. While conical one-lip bits
drill a slightly tapered hole, our ALFRA multi-step drill achieves a cylindrical
hole. The tools have axial-radial relief grindings and can be lightly reground
on the breast of the cutting tooth.
We recommend the use of pillar drilling machines, however, the small AL-
FRA Multi-step drills can be used on adjustable hand drilling machines. Suf-
ficient cooling using ALFRA coolant stick or a bore emulsion is imperative.
Speed chart rpm
Prod.-No. 08073
Type sheet steel stainless steel non-ferrous plastics
S235 sheets metals (soft)
AM drill 800 360 1000 1000
countersink 500 - 180 50 - 70 800 - 400 1000 - 400
AM-1 drill 800 360 1000 1000
countersink 200 - 100 100 - 50 500 - 200 600 - 250
PVD+PVK+DKI drill 800 360 1000 1000
PVD-VA + SVB countersink 400 - 200 200 - 100 800 - 500 1000 - 600
Prod.-No. 09012
M-S D – HSS DM O5
More precise hole diameter through cylindrical steps. Hole deburring through the next step.
B